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Amino acids

L-Theanine

Calm · focus

Tea-derived amino acid; alpha-wave EEG activity, calm focus, attenuates caffeine jitters. Common dose 100–400 mg.

Daily target
200 mg
Target Range
Upper limit
None
No UL established
Catalog matches
0
supplements in our catalog

How L-Theanine appears on labels

Supplement labels list L-Theanine under several names depending on the chemical form used. Any of these on an ingredients panel counts toward your L-Theanine intake:

  • l-theanine
  • theanine
  • suntheanine

Deep dive

For mechanism of action, dosing protocols, evidence grade, and interaction warnings on L-Theanine, see the full encyclopedia entry:

L-Theanine encyclopedia entry →

Related amino acids

Track your full intake

Formulate's free desktop app aggregates L-Theanine (and ~40 other nutrients) across every supplement in your stack — flagging underdoses, overlaps, and upper-limit overshoots in one view.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Targets and upper limits are general adult reference values; individual needs vary by age, sex, pregnancy status, and clinical context.